One Day by David Nicholls sold more than one million copies in the UK alone
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Will One Day become box office hit?

15 August 2011 Last updated at 18:50 BST

One Day, the bestseller by David Nicholls, has been adapted for the big screen.

The book has sold more than a million copies since it was first published and now film-makers are hoping to repeat that success.

Rebecca Jones reports